1254021243543 has 12 divisors (see below), whose sum is σ = 1811463200248. Its totient is φ = 835968386160.

The previous prime is 1254021243499. The next prime is 1254021243569. The reversal of 1254021243543 is 3453421204521.

It is a happy number.

1254021243543 is a `hidden beast` number, since 1 + 2 + 5 + 4 + 0 + 212 + 435 + 4 + 3 = 666.

It is not a de Polignac number, because 1254021243543 - 2⁸ = 1254021243287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1254021243498 and 1254021243507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1254021244543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3640768 + ... + 3970293.

Almost surely, 2^{1254021243543} is an apocalyptic number.

1254021243543 is a deficient number, since it is larger than the sum of its proper divisors (557441956705).

1254021243543 is a wasteful number, since it uses less digits than its factorization.

1254021243543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7629374 (or 7629371 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 1254021243543 in words is "one trillion, two hundred fifty-four billion, twenty-one million, two hundred forty-three thousand, five hundred forty-three".